[PATCH v12] phy: HiSilicon: Add driver for Kirin 970 PCIe PHY
Mauro Carvalho Chehab
mchehab+huawei at kernel.org
Wed Sep 15 06:11:14 PDT 2021
Hi Vinod,
Em Wed, 18 Aug 2021 13:04:07 +0200
Mauro Carvalho Chehab <mchehab+huawei at kernel.org> escreveu:
> The Kirin 970 PHY is somewhat similar to the Kirin 960, but it
> does a lot more. Add the needed bits for PCIe to start working on
> HiKey 970 boards.
>
> Co-developed-by: Manivannan Sadhasivam <mani at kernel.org>
> Signed-off-by: Manivannan Sadhasivam <mani at kernel.org>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei at kernel.org>
Gentile ping.
Regards,
Mauro
> ---
>
> PS.:
> As the PCIe patches aren't untouched, I'm sending just the PHY
> driver patch on v12.
>
> v12:
> - removed c99-style comments;
> - added hi3670_apb_phy_updatel() to update bits;
> - allowed a couple of lines to be bigger than 80 columns.
>
> drivers/phy/hisilicon/Kconfig | 10 +
> drivers/phy/hisilicon/Makefile | 1 +
> drivers/phy/hisilicon/phy-hi3670-pcie.c | 861 ++++++++++++++++++++++++
> 3 files changed, 872 insertions(+)
> create mode 100644 drivers/phy/hisilicon/phy-hi3670-pcie.c
>
> diff --git a/drivers/phy/hisilicon/Kconfig b/drivers/phy/hisilicon/Kconfig
> index 4d008cfc279c..d3b92c288554 100644
> --- a/drivers/phy/hisilicon/Kconfig
> +++ b/drivers/phy/hisilicon/Kconfig
> @@ -33,6 +33,16 @@ config PHY_HI3670_USB
>
> To compile this driver as a module, choose M here.
>
> +config PHY_HI3670_PCIE
> + tristate "hi3670 PCIe PHY support"
> + depends on (ARCH_HISI && ARM64) || COMPILE_TEST
> + select GENERIC_PHY
> + select MFD_SYSCON
> + help
> + Enable this to support the HiSilicon hi3670 PCIe PHY.
> +
> + To compile this driver as a module, choose M here.
> +
> config PHY_HISTB_COMBPHY
> tristate "HiSilicon STB SoCs COMBPHY support"
> depends on (ARCH_HISI && ARM64) || COMPILE_TEST
> diff --git a/drivers/phy/hisilicon/Makefile b/drivers/phy/hisilicon/Makefile
> index 51729868145b..4029d3813b1e 100644
> --- a/drivers/phy/hisilicon/Makefile
> +++ b/drivers/phy/hisilicon/Makefile
> @@ -2,6 +2,7 @@
> obj-$(CONFIG_PHY_HI6220_USB) += phy-hi6220-usb.o
> obj-$(CONFIG_PHY_HI3660_USB) += phy-hi3660-usb3.o
> obj-$(CONFIG_PHY_HI3670_USB) += phy-hi3670-usb3.o
> +obj-$(CONFIG_PHY_HI3670_PCIE) += phy-hi3670-pcie.o
> obj-$(CONFIG_PHY_HISTB_COMBPHY) += phy-histb-combphy.o
> obj-$(CONFIG_PHY_HISI_INNO_USB2) += phy-hisi-inno-usb2.o
> obj-$(CONFIG_PHY_HIX5HD2_SATA) += phy-hix5hd2-sata.o
> diff --git a/drivers/phy/hisilicon/phy-hi3670-pcie.c b/drivers/phy/hisilicon/phy-hi3670-pcie.c
> new file mode 100644
> index 000000000000..f0c66e8e155d
> --- /dev/null
> +++ b/drivers/phy/hisilicon/phy-hi3670-pcie.c
> @@ -0,0 +1,861 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe phy driver for Kirin 970
> + *
> + * Copyright (C) 2017 HiSilicon Electronics Co., Ltd.
> + * https://www.huawei.com
> + * Copyright (C) 2021 Huawei Technologies Co., Ltd.
> + * https://www.huawei.com
> + *
> + * Authors:
> + * Mauro Carvalho Chehab <mchehab+huawei at kernel.org>
> + * Manivannan Sadhasivam <mani at kernel.org>
> + *
> + * Based on:
> + * https://lore.kernel.org/lkml/4c9d6581478aa966698758c0420933f5defab4dd.1612335031.git.mchehab+huawei@kernel.org/
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/gpio.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of_gpio.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#define AXI_CLK_FREQ 207500000
> +#define REF_CLK_FREQ 100000000
> +
> +/* PCIe CTRL registers */
> +#define SOC_PCIECTRL_CTRL0_ADDR 0x000
> +#define SOC_PCIECTRL_CTRL1_ADDR 0x004
> +#define SOC_PCIECTRL_CTRL7_ADDR 0x01c
> +#define SOC_PCIECTRL_CTRL12_ADDR 0x030
> +#define SOC_PCIECTRL_CTRL20_ADDR 0x050
> +#define SOC_PCIECTRL_CTRL21_ADDR 0x054
> +#define SOC_PCIECTRL_STATE0_ADDR 0x400
> +
> +#define PCIE_OUTPUT_PULL_BITS GENMASK(3, 0)
> +#define SOC_PCIECTRL_CTRL20_2P_MEM_CTRL 0x02605550
> +#define SOC_PCIECTRL_CTRL21_DEFAULT 0x20000070
> +#define PCIE_PULL_UP_SYS_AUX_PWR_DET BIT(10)
> +#define PCIE_OUTPUT_PULL_DOWN BIT(1)
> +
> +/* PCIe PHY registers */
> +#define SOC_PCIEPHY_CTRL0_ADDR 0x000
> +#define SOC_PCIEPHY_CTRL1_ADDR 0x004
> +#define SOC_PCIEPHY_CTRL2_ADDR 0x008
> +#define SOC_PCIEPHY_CTRL3_ADDR 0x00c
> +#define SOC_PCIEPHY_CTRL38_ADDR 0x0098
> +#define SOC_PCIEPHY_STATE0_ADDR 0x400
> +
> +#define PORT_MSI_CTRL_ADDR 0x820
> +#define PORT_MSI_CTRL_UPPER_ADDR 0x824
> +#define PORT_MSI_CTRL_INT0_ENABLE 0x828
> +
> +#define RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1 0xc004
> +#define SUP_DIG_LVL_OVRD_IN 0x003c
> +#define LANEN_DIG_ASIC_TX_OVRD_IN_1 0x4008
> +#define LANEN_DIG_ASIC_TX_OVRD_IN_2 0x400c
> +
> +#define PCIE_LINKUP_ENABLE 0x8020
> +#define PCIE_ELBI_SLV_DBI_ENABLE BIT(21)
> +#define PCIE_LTSSM_ENABLE_BIT BIT(11)
> +#define PCIEPHY_RESET_BIT BIT(17)
> +#define PCIEPHY_PIPE_LINE0_RESET_BIT BIT(19)
> +#define PCIE_TXDETECT_RX_FAIL BIT(2)
> +#define PCIE_CLK_SOURCE BIT(8)
> +#define PCIE_IS_CLOCK_STABLE BIT(19)
> +#define PCIE_PULL_DOWN_PHY_TEST_POWERDOWN BIT(22)
> +#define PCIE_DEASSERT_CONTROLLER_PERST BIT(2)
> +
> +#define EYEPARAM_NOCFG 0xffffffff
> +#define EYE_PARM0_MASK GENMASK(8, 6)
> +#define EYE_PARM1_MASK GENMASK(11, 8)
> +#define EYE_PARM2_MASK GENMASK(5, 0)
> +#define EYE_PARM3_MASK GENMASK(12, 7)
> +#define EYE_PARM4_MASK GENMASK(14, 9)
> +#define EYE_PARM0_EN BIT(9)
> +#define EYE_PARM1_EN BIT(12)
> +#define EYE_PARM2_EN BIT(6)
> +#define EYE_PARM3_EN BIT(13)
> +#define EYE_PARM4_EN BIT(15)
> +
> +/* hi3670 pciephy register */
> +#define APB_PHY_START_ADDR 0x40000
> +#define SOC_PCIEPHY_MMC1PLL_CTRL1 0xc04
> +#define SOC_PCIEPHY_MMC1PLL_CTRL16 0xC40
> +#define SOC_PCIEPHY_MMC1PLL_CTRL17 0xC44
> +#define SOC_PCIEPHY_MMC1PLL_CTRL20 0xC50
> +#define SOC_PCIEPHY_MMC1PLL_CTRL21 0xC54
> +#define SOC_PCIEPHY_MMC1PLL_STAT0 0xE00
> +
> +#define CRGPERIPH_PEREN12 0x470
> +#define CRGPERIPH_PERDIS12 0x474
> +#define CRGPERIPH_PCIECTRL0 0x800
> +
> +#define PCIE_FNPLL_FBDIV_MASK GENMASK(27, 16)
> +#define PCIE_FNPLL_FRACDIV_MASK GENMASK(23, 0)
> +#define PCIE_FNPLL_POSTDIV1_MASK GENMASK(10, 8)
> +#define PCIE_FNPLL_POSTDIV2_MASK GENMASK(14, 12)
> +#define PCIE_FNPLL_PLL_MODE_MASK BIT(25)
> +
> +#define PCIE_FNPLL_DLL_EN BIT(27)
> +#define PCIE_FNPLL_FBDIV 0xd0
> +#define PCIE_FNPLL_FRACDIV 0x555555
> +#define PCIE_FNPLL_POSTDIV1 0x5
> +#define PCIE_FNPLL_POSTDIV2 0x4
> +#define PCIE_FNPLL_PLL_MODE 0x0
> +
> +#define PCIE_PHY_MMC1PLL 0x20
> +#define PCIE_PHY_CHOOSE_FNPLL BIT(27)
> +#define PCIE_PHY_MMC1PLL_DISABLE BIT(0)
> +#define PCIE_PHY_PCIEPL_BP BIT(16)
> +
> +/* define ie,oe cfg */
> +#define IO_OE_HARD_GT_MODE BIT(1)
> +#define IO_IE_EN_HARD_BYPASS BIT(27)
> +#define IO_OE_EN_HARD_BYPASS BIT(11)
> +#define IO_HARD_CTRL_DEBOUNCE_BYPASS BIT(10)
> +#define IO_OE_GT_MODE BIT(8)
> +#define DEBOUNCE_WAITCFG_IN GENMASK(23, 20)
> +#define DEBOUNCE_WAITCFG_OUT GENMASK(16, 13)
> +
> +#define IO_HP_DEBOUNCE_GT (BIT(12) | BIT(15))
> +#define IO_PHYREF_SOFT_GT_MODE BIT(14)
> +#define IO_REF_SOFT_GT_MODE BIT(13)
> +#define IO_REF_HARD_GT_MODE BIT(0)
> +
> +/* noc power domain */
> +#define NOC_POWER_IDLEREQ_1 0x38c
> +#define NOC_POWER_IDLE_1 0x394
> +#define NOC_PW_MASK 0x10000
> +#define NOC_PW_SET_BIT 0x1
> +
> +#define NUM_EYEPARAM 5
> +
> +/* info located in sysctrl */
> +#define SCTRL_PCIE_CMOS_OFFSET 0x60
> +#define SCTRL_PCIE_CMOS_BIT 0x10
> +#define SCTRL_PCIE_ISO_OFFSET 0x44
> +#define SCTRL_PCIE_ISO_BIT 0x30
> +#define SCTRL_PCIE_HPCLK_OFFSET 0x190
> +#define SCTRL_PCIE_HPCLK_BIT 0x184000
> +#define SCTRL_PCIE_OE_OFFSET 0x14a
> +#define PCIE_DEBOUNCE_PARAM 0xf0f400
> +#define PCIE_OE_BYPASS GENMASK(29, 28)
> +
> +/* peri_crg ctrl */
> +#define CRGCTRL_PCIE_ASSERT_OFFSET 0x88
> +#define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000
> +
> +#define FNPLL_HAS_LOCKED BIT(4)
> +
> +/* Time for delay */
> +#define PIPE_CLK_WAIT_MIN 550
> +#define PIPE_CLK_WAIT_MAX 600
> +#define TIME_CMOS_MIN 100
> +#define TIME_CMOS_MAX 105
> +#define TIME_PHY_PD_MIN 10
> +#define TIME_PHY_PD_MAX 11
> +
> +#define PIPE_CLK_STABLE_TIME 100
> +#define PLL_CTRL_WAIT_TIME 200
> +#define NOC_POWER_TIME 100
> +
> +struct hi3670_pcie_phy {
> + struct device *dev;
> + void __iomem *base;
> + struct regmap *apb;
> + struct regmap *crgctrl;
> + struct regmap *sysctrl;
> + struct regmap *pmctrl;
> + struct clk *apb_sys_clk;
> + struct clk *apb_phy_clk;
> + struct clk *phy_ref_clk;
> + struct clk *aclk;
> + struct clk *aux_clk;
> + u32 eye_param[NUM_EYEPARAM];
> +};
> +
> +/* Registers in PCIePHY */
> +static inline void hi3670_apb_phy_writel(struct hi3670_pcie_phy *phy, u32 val,
> + u32 reg)
> +{
> + writel(val, phy->base + APB_PHY_START_ADDR + reg);
> +}
> +
> +static inline u32 hi3670_apb_phy_readl(struct hi3670_pcie_phy *phy, u32 reg)
> +{
> + return readl(phy->base + APB_PHY_START_ADDR + reg);
> +}
> +
> +static inline void hi3670_apb_phy_updatel(struct hi3670_pcie_phy *phy,
> + u32 val, u32 mask, u32 reg)
> +{
> + u32 regval;
> +
> + regval = hi3670_apb_phy_readl(phy, reg);
> + regval &= ~mask;
> + regval |= val;
> + hi3670_apb_phy_writel(phy, regval, reg);
> +}
> +
> +static inline void kirin_apb_natural_phy_writel(struct hi3670_pcie_phy *phy,
> + u32 val, u32 reg)
> +{
> + writel(val, phy->base + reg);
> +}
> +
> +static inline u32 kirin_apb_natural_phy_readl(struct hi3670_pcie_phy *phy,
> + u32 reg)
> +{
> + return readl(phy->base + reg);
> +}
> +
> +static void hi3670_pcie_phy_oe_enable(struct hi3670_pcie_phy *phy, bool enable)
> +{
> + u32 val;
> +
> + regmap_read(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, &val);
> + val |= PCIE_DEBOUNCE_PARAM;
> + if (enable)
> + val &= ~PCIE_OE_BYPASS;
> + else
> + val |= PCIE_OE_BYPASS;
> + regmap_write(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val);
> +}
> +
> +static void hi3670_pcie_get_eyeparam(struct hi3670_pcie_phy *phy)
> +{
> + struct device *dev = phy->dev;
> + struct device_node *np;
> + int ret, i;
> +
> + np = dev->of_node;
> +
> + ret = of_property_read_u32_array(np, "hisilicon,eye-diagram-param",
> + phy->eye_param, NUM_EYEPARAM);
> + if (!ret)
> + return;
> +
> + /* There's no optional eye_param property. Set array to default */
> + for (i = 0; i < NUM_EYEPARAM; i++)
> + phy->eye_param[i] = EYEPARAM_NOCFG;
> +}
> +
> +static void hi3670_pcie_set_eyeparam(struct hi3670_pcie_phy *phy)
> +{
> + u32 val;
> +
> + val = kirin_apb_natural_phy_readl(phy, RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1);
> +
> + if (phy->eye_param[1] != EYEPARAM_NOCFG) {
> + val &= ~EYE_PARM1_MASK;
> + val |= FIELD_PREP(EYE_PARM1_MASK, phy->eye_param[1]);
> + val |= EYE_PARM1_EN;
> + }
> + kirin_apb_natural_phy_writel(phy, val,
> + RAWLANEN_DIG_PCS_XF_TX_OVRD_IN_1);
> +
> + val = kirin_apb_natural_phy_readl(phy, LANEN_DIG_ASIC_TX_OVRD_IN_2);
> + val &= ~(EYE_PARM2_MASK | EYE_PARM3_MASK);
> + if (phy->eye_param[2] != EYEPARAM_NOCFG) {
> + val |= FIELD_PREP(EYE_PARM2_MASK, phy->eye_param[2]);
> + val |= EYE_PARM2_EN;
> + }
> +
> + if (phy->eye_param[3] != EYEPARAM_NOCFG) {
> + val |= FIELD_PREP(EYE_PARM3_MASK, phy->eye_param[3]);
> + val |= EYE_PARM3_EN;
> + }
> +
> + kirin_apb_natural_phy_writel(phy, val, LANEN_DIG_ASIC_TX_OVRD_IN_2);
> +
> + val = kirin_apb_natural_phy_readl(phy, SUP_DIG_LVL_OVRD_IN);
> + if (phy->eye_param[0] != EYEPARAM_NOCFG) {
> + val &= ~EYE_PARM0_MASK;
> + val |= FIELD_PREP(EYE_PARM0_MASK, phy->eye_param[0]);
> + val |= EYE_PARM0_EN;
> + }
> + kirin_apb_natural_phy_writel(phy, val, SUP_DIG_LVL_OVRD_IN);
> +
> + val = kirin_apb_natural_phy_readl(phy, LANEN_DIG_ASIC_TX_OVRD_IN_1);
> + if (phy->eye_param[4] != EYEPARAM_NOCFG) {
> + val &= ~EYE_PARM4_MASK;
> + val |= FIELD_PREP(EYE_PARM4_MASK, phy->eye_param[4]);
> + val |= EYE_PARM4_EN;
> + }
> + kirin_apb_natural_phy_writel(phy, val, LANEN_DIG_ASIC_TX_OVRD_IN_1);
> +}
> +
> +static void hi3670_pcie_natural_cfg(struct hi3670_pcie_phy *phy)
> +{
> + u32 val;
> +
> + /* change 2p mem_ctrl */
> + regmap_write(phy->apb, SOC_PCIECTRL_CTRL20_ADDR,
> + SOC_PCIECTRL_CTRL20_2P_MEM_CTRL);
> +
> + regmap_read(phy->apb, SOC_PCIECTRL_CTRL7_ADDR, &val);
> + val |= PCIE_PULL_UP_SYS_AUX_PWR_DET;
> + regmap_write(phy->apb, SOC_PCIECTRL_CTRL7_ADDR, val);
> +
> + /* output, pull down */
> + regmap_read(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, &val);
> + val &= ~PCIE_OUTPUT_PULL_BITS;
> + val |= PCIE_OUTPUT_PULL_DOWN;
> + regmap_write(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, val);
> +
> + /* Handle phy_reset and lane0_reset to HW */
> + hi3670_apb_phy_updatel(phy, PCIEPHY_RESET_BIT,
> + PCIEPHY_PIPE_LINE0_RESET_BIT | PCIEPHY_RESET_BIT,
> + SOC_PCIEPHY_CTRL1_ADDR);
> +
> + /* fix chip bug: TxDetectRx fail */
> + hi3670_apb_phy_updatel(phy, PCIE_TXDETECT_RX_FAIL, PCIE_TXDETECT_RX_FAIL,
> + SOC_PCIEPHY_CTRL38_ADDR);
> +}
> +
> +static void hi3670_pcie_pll_init(struct hi3670_pcie_phy *phy)
> +{
> + hi3670_apb_phy_updatel(phy, PCIE_PHY_CHOOSE_FNPLL, PCIE_PHY_CHOOSE_FNPLL,
> + SOC_PCIEPHY_MMC1PLL_CTRL1);
> +
> +
> + hi3670_apb_phy_updatel(phy,
> + FIELD_PREP(PCIE_FNPLL_FBDIV_MASK, PCIE_FNPLL_FBDIV),
> + PCIE_FNPLL_FBDIV_MASK,
> + SOC_PCIEPHY_MMC1PLL_CTRL16);
> +
> + hi3670_apb_phy_updatel(phy,
> + FIELD_PREP(PCIE_FNPLL_FRACDIV_MASK, PCIE_FNPLL_FRACDIV),
> + PCIE_FNPLL_FRACDIV_MASK, SOC_PCIEPHY_MMC1PLL_CTRL17);
> +
> + hi3670_apb_phy_updatel(phy,
> + PCIE_FNPLL_DLL_EN |
> + FIELD_PREP(PCIE_FNPLL_POSTDIV1_MASK, PCIE_FNPLL_POSTDIV1) |
> + FIELD_PREP(PCIE_FNPLL_POSTDIV2_MASK, PCIE_FNPLL_POSTDIV2) |
> + FIELD_PREP(PCIE_FNPLL_PLL_MODE_MASK, PCIE_FNPLL_PLL_MODE),
> + PCIE_FNPLL_POSTDIV1_MASK |
> + PCIE_FNPLL_POSTDIV2_MASK |
> + PCIE_FNPLL_PLL_MODE_MASK | PCIE_FNPLL_DLL_EN,
> + SOC_PCIEPHY_MMC1PLL_CTRL20);
> +
> + hi3670_apb_phy_writel(phy, PCIE_PHY_MMC1PLL,
> + SOC_PCIEPHY_MMC1PLL_CTRL21);
> +}
> +
> +static int hi3670_pcie_pll_ctrl(struct hi3670_pcie_phy *phy, bool enable)
> +{
> + struct device *dev = phy->dev;
> + u32 val;
> + int time = PLL_CTRL_WAIT_TIME;
> +
> + if (enable) {
> + /* pd = 0 */
> + hi3670_apb_phy_updatel(phy, 0, PCIE_PHY_MMC1PLL_DISABLE,
> + SOC_PCIEPHY_MMC1PLL_CTRL16);
> +
> + /* choose FNPLL */
> + while (!(val & FNPLL_HAS_LOCKED)) {
> + if (!time) {
> + dev_err(dev, "wait for pll_lock timeout\n");
> + return -EINVAL;
> + }
> + time--;
> + udelay(1);
> + val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_MMC1PLL_STAT0);
> + }
> +
> + hi3670_apb_phy_updatel(phy, 0, PCIE_PHY_PCIEPL_BP,
> + SOC_PCIEPHY_MMC1PLL_CTRL20);
> +
> + } else {
> + hi3670_apb_phy_updatel(phy,
> + PCIE_PHY_MMC1PLL_DISABLE,
> + PCIE_PHY_MMC1PLL_DISABLE,
> + SOC_PCIEPHY_MMC1PLL_CTRL16);
> +
> + hi3670_apb_phy_updatel(phy, PCIE_PHY_PCIEPL_BP,
> + PCIE_PHY_PCIEPL_BP,
> + SOC_PCIEPHY_MMC1PLL_CTRL20);
> + }
> +
> + return 0;
> +}
> +
> +static void hi3670_pcie_hp_debounce_gt(struct hi3670_pcie_phy *phy, bool open)
> +{
> + if (open)
> + /* gt_clk_pcie_hp/gt_clk_pcie_debounce open */
> + regmap_write(phy->crgctrl, CRGPERIPH_PEREN12,
> + IO_HP_DEBOUNCE_GT);
> + else
> + /* gt_clk_pcie_hp/gt_clk_pcie_debounce close */
> + regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
> + IO_HP_DEBOUNCE_GT);
> +}
> +
> +static void hi3670_pcie_phyref_gt(struct hi3670_pcie_phy *phy, bool open)
> +{
> + unsigned int val;
> +
> + regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
> +
> + if (open)
> + val &= ~IO_OE_HARD_GT_MODE; /* enable hard gt mode */
> + else
> + val |= IO_OE_HARD_GT_MODE; /* disable hard gt mode */
> +
> + regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
> +
> + /* disable soft gt mode */
> + regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12, IO_PHYREF_SOFT_GT_MODE);
> +}
> +
> +static void hi3670_pcie_oe_ctrl(struct hi3670_pcie_phy *phy, bool en_flag)
> +{
> + unsigned int val;
> +
> + regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
> +
> + /* set ie cfg */
> + val |= IO_IE_EN_HARD_BYPASS;
> +
> + /* set oe cfg */
> + val &= ~IO_HARD_CTRL_DEBOUNCE_BYPASS;
> +
> + /* set phy_debounce in&out time */
> + val |= (DEBOUNCE_WAITCFG_IN | DEBOUNCE_WAITCFG_OUT);
> +
> + /* select oe_gt_mode */
> + val |= IO_OE_GT_MODE;
> +
> + if (en_flag)
> + val &= ~IO_OE_EN_HARD_BYPASS;
> + else
> + val |= IO_OE_EN_HARD_BYPASS;
> +
> + regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
> +}
> +
> +static void hi3670_pcie_ioref_gt(struct hi3670_pcie_phy *phy, bool open)
> +{
> + unsigned int val;
> +
> + if (open) {
> + regmap_write(phy->apb, SOC_PCIECTRL_CTRL21_ADDR,
> + SOC_PCIECTRL_CTRL21_DEFAULT);
> +
> + hi3670_pcie_oe_ctrl(phy, true);
> +
> + /* en hard gt mode */
> + regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
> + val &= ~IO_REF_HARD_GT_MODE;
> + regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
> +
> + /* disable soft gt mode */
> + regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
> + IO_REF_SOFT_GT_MODE);
> +
> + } else {
> + /* disable hard gt mode */
> + regmap_read(phy->crgctrl, CRGPERIPH_PCIECTRL0, &val);
> + val |= IO_REF_HARD_GT_MODE;
> + regmap_write(phy->crgctrl, CRGPERIPH_PCIECTRL0, val);
> +
> + /* disable soft gt mode */
> + regmap_write(phy->crgctrl, CRGPERIPH_PERDIS12,
> + IO_REF_SOFT_GT_MODE);
> +
> + hi3670_pcie_oe_ctrl(phy, false);
> + }
> +}
> +
> +static int hi3670_pcie_allclk_ctrl(struct hi3670_pcie_phy *phy, bool clk_on)
> +{
> + struct device *dev = phy->dev;
> + int ret = 0;
> +
> + if (!clk_on)
> + goto close_clocks;
> +
> + /* choose 100MHz clk src: Bit[8]==1 pad, Bit[8]==0 pll */
> + hi3670_apb_phy_updatel(phy, 0, PCIE_CLK_SOURCE,
> + SOC_PCIEPHY_CTRL1_ADDR);
> +
> + hi3670_pcie_pll_init(phy);
> +
> + ret = hi3670_pcie_pll_ctrl(phy, true);
> + if (ret) {
> + dev_err(dev, "Failed to enable pll\n");
> + return -EINVAL;
> + }
> + hi3670_pcie_hp_debounce_gt(phy, true);
> + hi3670_pcie_phyref_gt(phy, true);
> + hi3670_pcie_ioref_gt(phy, true);
> +
> + ret = clk_set_rate(phy->aclk, AXI_CLK_FREQ);
> + if (ret) {
> + dev_err(dev, "Failed to set rate\n");
> + goto close_clocks;
> + }
> +
> + return 0;
> +
> +close_clocks:
> + hi3670_pcie_ioref_gt(phy, false);
> + hi3670_pcie_phyref_gt(phy, false);
> + hi3670_pcie_hp_debounce_gt(phy, false);
> +
> + hi3670_pcie_pll_ctrl(phy, false);
> +
> + return ret;
> +}
> +
> +static bool is_pipe_clk_stable(struct hi3670_pcie_phy *phy)
> +{
> + struct device *dev = phy->dev;
> + u32 val;
> + u32 time = PIPE_CLK_STABLE_TIME;
> + u32 pipe_clk_stable = PCIE_IS_CLOCK_STABLE;
> +
> + val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_STATE0_ADDR);
> + while (val & pipe_clk_stable) {
> + mdelay(1);
> + if (!time) {
> + dev_err(dev, "PIPE clk is not stable\n");
> + return false;
> + }
> + time--;
> + val = hi3670_apb_phy_readl(phy, SOC_PCIEPHY_STATE0_ADDR);
> + }
> +
> + return true;
> +}
> +
> +static int hi3670_pcie_noc_power(struct hi3670_pcie_phy *phy, bool enable)
> +{
> + struct device *dev = phy->dev;
> + u32 time = NOC_POWER_TIME;
> + unsigned int val = NOC_PW_MASK;
> + int rst;
> +
> + if (enable)
> + val = NOC_PW_MASK | NOC_PW_SET_BIT;
> + else
> + val = NOC_PW_MASK;
> + rst = enable ? 1 : 0;
> +
> + regmap_write(phy->pmctrl, NOC_POWER_IDLEREQ_1, val);
> +
> + time = NOC_POWER_TIME;
> + regmap_read(phy->pmctrl, NOC_POWER_IDLE_1, &val);
> + while ((val & NOC_PW_SET_BIT) != rst) {
> + udelay(10);
> + if (!time) {
> + dev_err(dev, "Failed to reverse noc power-status\n");
> + return -EINVAL;
> + }
> + time--;
> + regmap_read(phy->pmctrl, NOC_POWER_IDLE_1, &val);
> + }
> +
> + return 0;
> +}
> +
> +static int hi3670_pcie_get_resources_from_pcie(struct hi3670_pcie_phy *phy)
> +{
> + struct device_node *pcie_port;
> + struct device *dev = phy->dev;
> + struct device *pcie_dev;
> +
> + pcie_port = of_get_child_by_name(dev->parent->of_node, "pcie");
> + if (!pcie_port) {
> + dev_err(dev, "no pcie node found in %s\n",
> + dev->parent->of_node->full_name);
> + return -ENODEV;
> + }
> +
> + pcie_dev = bus_find_device_by_of_node(&platform_bus_type, pcie_port);
> + if (!pcie_dev) {
> + dev_err(dev, "Didn't find pcie device\n");
> + return -ENODEV;
> + }
> +
> + /*
> + * We might just use NULL instead of the APB name, as the
> + * pcie-kirin currently registers directly just one regmap (although
> + * the DWC driver register other regmaps).
> + *
> + * Yet, it sounds safer to warrant that it will be accessing the
> + * right regmap. So, let's use the named version.
> + */
> + phy->apb = dev_get_regmap(pcie_dev, "kirin_pcie_apb");
> + if (!phy->apb) {
> + dev_err(dev, "Failed to get APB regmap\n");
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> +static int kirin_pcie_clk_ctrl(struct hi3670_pcie_phy *phy, bool enable)
> +{
> + int ret = 0;
> +
> + if (!enable)
> + goto close_clk;
> +
> + ret = clk_set_rate(phy->phy_ref_clk, REF_CLK_FREQ);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(phy->phy_ref_clk);
> + if (ret)
> + return ret;
> +
> + ret = clk_prepare_enable(phy->apb_sys_clk);
> + if (ret)
> + goto apb_sys_fail;
> +
> + ret = clk_prepare_enable(phy->apb_phy_clk);
> + if (ret)
> + goto apb_phy_fail;
> +
> + ret = clk_prepare_enable(phy->aclk);
> + if (ret)
> + goto aclk_fail;
> +
> + ret = clk_prepare_enable(phy->aux_clk);
> + if (ret)
> + goto aux_clk_fail;
> +
> + return 0;
> +
> +close_clk:
> + clk_disable_unprepare(phy->aux_clk);
> +aux_clk_fail:
> + clk_disable_unprepare(phy->aclk);
> +aclk_fail:
> + clk_disable_unprepare(phy->apb_phy_clk);
> +apb_phy_fail:
> + clk_disable_unprepare(phy->apb_sys_clk);
> +apb_sys_fail:
> + clk_disable_unprepare(phy->phy_ref_clk);
> +
> + return ret;
> +}
> +
> +static int hi3670_pcie_phy_init(struct phy *generic_phy)
> +{
> + struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
> + int ret;
> +
> + /*
> + * The code under hi3670_pcie_get_resources_from_pcie() need to
> + * access the reset-gpios and the APB registers, both from the
> + * pcie-kirin driver.
> + *
> + * The APB is obtained via the pcie driver's regmap
> + * Such kind of resource can only be obtained during the PCIe
> + * power_on sequence, as the code inside pcie-kirin needs to
> + * be already probed, as it needs to register the APB regmap.
> + */
> +
> + ret = hi3670_pcie_get_resources_from_pcie(phy);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int hi3670_pcie_phy_power_on(struct phy *generic_phy)
> +{
> + struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
> + int val, ret;
> +
> + /* Power supply for Host */
> + regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT);
> + usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX);
> +
> + hi3670_pcie_phy_oe_enable(phy, true);
> +
> + ret = kirin_pcie_clk_ctrl(phy, true);
> + if (ret)
> + return ret;
> +
> + /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */
> + regmap_write(phy->sysctrl, SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT);
> + regmap_write(phy->crgctrl, CRGCTRL_PCIE_ASSERT_OFFSET,
> + CRGCTRL_PCIE_ASSERT_BIT);
> + regmap_write(phy->sysctrl, SCTRL_PCIE_HPCLK_OFFSET,
> + SCTRL_PCIE_HPCLK_BIT);
> +
> + hi3670_pcie_natural_cfg(phy);
> +
> + ret = hi3670_pcie_allclk_ctrl(phy, true);
> + if (ret)
> + goto disable_clks;
> +
> + /* pull down phy_test_powerdown signal */
> + hi3670_apb_phy_updatel(phy, 0, PCIE_PULL_DOWN_PHY_TEST_POWERDOWN,
> + SOC_PCIEPHY_CTRL0_ADDR);
> +
> + /* deassert controller perst_n */
> + regmap_read(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, &val);
> + val |= PCIE_DEASSERT_CONTROLLER_PERST;
> + regmap_write(phy->apb, SOC_PCIECTRL_CTRL12_ADDR, val);
> + udelay(10);
> +
> + ret = is_pipe_clk_stable(phy);
> + if (!ret)
> + goto disable_clks;
> +
> + hi3670_pcie_set_eyeparam(phy);
> +
> + ret = hi3670_pcie_noc_power(phy, false);
> + if (ret)
> + goto disable_clks;
> +
> + return 0;
> +
> +disable_clks:
> + kirin_pcie_clk_ctrl(phy, false);
> + return ret;
> +}
> +
> +static int hi3670_pcie_phy_power_off(struct phy *generic_phy)
> +{
> + struct hi3670_pcie_phy *phy = phy_get_drvdata(generic_phy);
> +
> + hi3670_pcie_phy_oe_enable(phy, false);
> +
> + hi3670_pcie_allclk_ctrl(phy, false);
> +
> + /* Drop power supply for Host */
> + regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, 0);
> +
> + /*
> + * FIXME: The enabled clocks should be disabled here by calling
> + * kirin_pcie_clk_ctrl(phy, false);
> + * However, some clocks used at Kirin 970 should be marked as
> + * CLK_IS_CRITICAL at clk-hi3670 driver, as powering such clocks off
> + * cause an Asynchronous SError interrupt, which produces panic().
> + * While clk-hi3670 is not fixed, we cannot risk disabling clocks here.
> + */
> +
> + return 0;
> +}
> +
> +static const struct phy_ops hi3670_phy_ops = {
> + .init = hi3670_pcie_phy_init,
> + .power_on = hi3670_pcie_phy_power_on,
> + .power_off = hi3670_pcie_phy_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static int hi3670_pcie_phy_get_resources(struct hi3670_pcie_phy *phy,
> + struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> +
> + /* syscon */
> + phy->crgctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-crgctrl");
> + if (IS_ERR(phy->crgctrl))
> + return PTR_ERR(phy->crgctrl);
> +
> + phy->sysctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-sctrl");
> + if (IS_ERR(phy->sysctrl))
> + return PTR_ERR(phy->sysctrl);
> +
> + phy->pmctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3670-pmctrl");
> + if (IS_ERR(phy->sysctrl))
> + return PTR_ERR(phy->sysctrl);
> +
> + /* clocks */
> + phy->phy_ref_clk = devm_clk_get(dev, "phy_ref");
> + if (IS_ERR(phy->phy_ref_clk))
> + return PTR_ERR(phy->phy_ref_clk);
> +
> + phy->aux_clk = devm_clk_get(dev, "aux");
> + if (IS_ERR(phy->aux_clk))
> + return PTR_ERR(phy->aux_clk);
> +
> + phy->apb_phy_clk = devm_clk_get(dev, "apb_phy");
> + if (IS_ERR(phy->apb_phy_clk))
> + return PTR_ERR(phy->apb_phy_clk);
> +
> + phy->apb_sys_clk = devm_clk_get(dev, "apb_sys");
> + if (IS_ERR(phy->apb_sys_clk))
> + return PTR_ERR(phy->apb_sys_clk);
> +
> + phy->aclk = devm_clk_get(dev, "aclk");
> + if (IS_ERR(phy->aclk))
> + return PTR_ERR(phy->aclk);
> +
> + /* registers */
> + phy->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(phy->base))
> + return PTR_ERR(phy->base);
> +
> + hi3670_pcie_get_eyeparam(phy);
> +
> + return 0;
> +}
> +
> +static int hi3670_pcie_phy_probe(struct platform_device *pdev)
> +{
> + struct phy_provider *phy_provider;
> + struct device *dev = &pdev->dev;
> + struct hi3670_pcie_phy *phy;
> + struct phy *generic_phy;
> + int ret;
> +
> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy)
> + return -ENOMEM;
> +
> + phy->dev = dev;
> +
> + ret = hi3670_pcie_phy_get_resources(phy, pdev);
> + if (ret)
> + return ret;
> +
> + generic_phy = devm_phy_create(dev, dev->of_node, &hi3670_phy_ops);
> + if (IS_ERR(generic_phy)) {
> + dev_err(dev, "failed to create PHY\n");
> + return PTR_ERR(generic_phy);
> + }
> +
> + phy_set_drvdata(generic_phy, phy);
> + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +
> + return PTR_ERR_OR_ZERO(phy_provider);
> +}
> +
> +static const struct of_device_id hi3670_pcie_phy_match[] = {
> + {
> + .compatible = "hisilicon,hi970-pcie-phy",
> + },
> + {},
> +};
> +
> +static struct platform_driver hi3670_pcie_phy_driver = {
> + .probe = hi3670_pcie_phy_probe,
> + .driver = {
> + .of_match_table = hi3670_pcie_phy_match,
> + .name = "hi3670_pcie_phy",
> + .suppress_bind_attrs = true,
> + }
> +};
> +builtin_platform_driver(hi3670_pcie_phy_driver);
> +
> +MODULE_DEVICE_TABLE(of, hi3670_pcie_phy_match);
> +MODULE_DESCRIPTION("PCIe phy driver for Kirin 970");
> +MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab at kernel.org>");
> +MODULE_AUTHOR("Manivannan Sadhasivam <mani at kernel.org>");
> +MODULE_LICENSE("GPL v2");
Thanks,
Mauro
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